I’m not quite sure what you mean. Was the card in question an advertisement for an event–for example, at a club (or something similar)? The women were likely paid models chosen with the intent of luring business to the venue. As the cliche goes: sex sells. I suspect that with advertisements and in media, we need to question perception–how the individual perceives his/herself, how others view the individual, even our own interpretation.
Moreover, who decides what determines whether someone’s dress is “sexual” or “erotic”? What might seem merely scanty to one person might be quite tame by another individual’s standards–and might be taboo to another’s. For example, a bathing costume from the Victorian era would be extremely modest to someone living in California in the 1990s, but a modern woman in Brazil might find a one-piece tame compared to a string bikini–which she regards as perfectly acceptable. Meanwhile, her contemporary in France is wondering what the issue with bathing suits is; in her experience, most people don’t bother wearing anything to the beach.